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HOLLOWCORE FLOORS
SPEED AND STRENGTH
CONTENTS
INTRODUCTIONPRECASTCONCRETE FLOORST
HE
A
DVANTAGES
BISON HOLLOWCORE FLOORSBEARINGSFALSE CEILINGS AND SOFFITFIXINGSBISON HOLLOWCOMPOSITEFLOORSBISON SOLID COMPOSITEFLOORSBISON SOLID COMPOSITEFLOORSC
ONSTRUCTION
D
ETAILS
SOUND INSULATIONW
ITH
B
ISON
H
OLLOW
C
ORE
S
LABS
BISON PRECASTFLOORINGSPECIFICATIONQUALITYASSURANCE
235479813101214
INTRODUCTION
Bison is the largest producer of precast concretefloors in the United Kingdom.Thecompanyhasbeenaleaderinthedesign andmanufactureofstructuralproductssince1919.There are five Bison factories throughout theUnited Kingdom strategically situated to providea comprehensive service to our customers.This brochure describes the extensive range of precast flooring available to the specifier.Other products pioneered by Bison and for whichthey hold a market leading position include housefloors for use both at ground floor and intermediatelevels and precast prestressed staircases produced bya patented method which provides a product of excellent quality at moderate cost.In the field of structures too, Bison is a marketleaderproducingprecastconcrete,steel andcomposite structures for use in retail,industrial,commercial buildings and car parks as well as inhousing, educational and government projects.Brochures on other Bison products and services forthe construction industry are listed on the backcover of this brochure.
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Speed of Erection
Time consuming activities such as propping,shuttering and concrete pouring are virtuallyeliminated.
Diaphragm Action
Precastfloorslabsarestructurallygroutedtoprovidea floor with full diaphragm action as required inmost multi–storey frameworks.
Shelf Angle Bearing
Slab ends can be notched during manufacture tofacilitate a bearing within the depth of a mainsupporting steel. This minimises storey height, withsubstantialcostbenefits arising fromreducedcladding costs, lower internal fitting costs etc.
No Propping
Propping is generally not required with hollow corefloors.Comparethiswith thelargeamountof propping required with insitu and semi-insitu floorsystems.
Fire Resistance
Standard precast floors can be supplied with a fireresistance of up to 2 hours.Periods in excess ofthiscan be provided with modified sectionsif required.
Minimum Insitu Concrete
Using a precast floor, a large volume of work iscarried out off site and saves what can be complexand time consuming site operation subject to thevagaries of the climate.
Immediate Unpropped Working Platform
Once a precast floor is erected, it is immediatelyavailable as a working platform.Steel deck systems by comparison can presentproblems in achieving level surfaces whilst concreteis poured and in providing access whilst in thepropped condition.
PRECASTCONCRETE FLOORS
THE ADVANTAGES
Preformed Site Services
Precast floors can be provided with factory formedservice holes thus avoiding laborious setting outand shuttering on site.
Extra Long Spans
Factory made prestressed units offer the maximumdesign advantages of achieving long span units forgiven depths. This avoids the need for intermediatesupports and provides an economically light solutionthroughouttheentire structure. The Bison long span450 mmdeep unitcan span in excess of16 metres.
Finished Soffits
Precast floors are manufactured on high qualitysteelbedsand are suitablein appropriate cases fordirectdecoration.
Flexibility of Design Approach
Precast floors are available with a variety of factory formed notches, slots and reinforcementarrangements which offer various design approaches.
Elimination of Edge Shuttering
Edge shuttering to any building is inevitably adifficult and often dangerous operation. This can betotally avoided by using a precast floor.
Structural Efficiency
Ahollowcore slaboffers the ideal structural sectionby reducing the deadweight whilst providing themaximumstructuralefficiencywithintheslabdepth.
FactoryProducedtoRigorousQualityStandards
Becauseprecastfloors arefactoryproduced,theyare manufacturedinan environment which is morereadilycontrolledthanabuildingsite.Qualitycontrol systemsare properly implementedand are independently examined on a regular basisundertheBritishStandardsInstitution QualityAssuranceScheme.
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